Asthma prevalence has steadily increased in the United States since the early 1980s; currently, more than 20 million people are diagnosed with asthma. Individuals with this disease may experience periodic attacks of wheezing, shortness of breath, chest tightness, and coughing. While there are many known causes of asthma, including tobacco smoke and other allergens, the exact cause of some asthma cases remains unknown. Research has shown that in some individuals, respiratory airway infections may play a role in the onset and severity of the disease. Inhaled corticosteroids are commonly used to treat asthma; however, they do not effectively control symptoms for everyone. Clarithromycin, an antibiotic medication used to treat bacterial infections, may be an effective asthma treatment for individuals who do not respond well to inhaled corticosteroids. The purpose of this study is to evaluate the effectiveness of clarithromycin at reducing asthma symptoms.